I got into the PC Beta not to long ago.
Coming form casual play of 1.6, I really am liking Global Offensive.
My only gripe is the buy menu is a clear design choice for console players in mind, being un-intuitive for PC. Also, it plays a LOT like Left 4 Dead 2 did. Sometimes I just call it Counter 4 Dead.
But besides that, I really do like this version of CS!